"fred"

There are life issues too, derate working voltage to 60 or 70% of spec and
they last 10x longer.

** That is complete nonsense.

Electro life is not related to DC operating voltage, unless the rated limit
is exceeded then it is VERY short.


Similar issues with temp, 105degC caps last forever when derated.


** Also complete nonsense - there is little increase in expected life
using 105C types unless the local ambient is over 75C.

Electro lifespan is all about the quality of the airtight seal in the end of
the cap - cos the end of life occurs when most of the electrolyte has
escaped as vapour through an imperfect seal. The rate of loss of electrolyte
is a function of the local ambient temperature and ripple current ( if any)
heating the electro.

105C types can operate at higher temps, that is their only advantage.

Long life electros come in both 85C and 105 C types - all that is different
is the quality of that seal.



...... Phil